Lukas was a powerful Demonic Infector in possession of the Seven Deadly Sins. His goal was to infect people with sin, causing them to self-destruction and giving him their souls. When the Charmed Ones interfered in his business, he infected them and Leo with sins.

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One of Lukas' couriers lost the box to Prue and Phoebe. The courier was fighting off Robert Pike, who was infected with Greed. Pike wanted more. When the sisters witnessed this, Prue telekinetically moved the box across the road. Pike ran after it and was hit by a bus. Angered because he lost the box, Lukas began to strangle the courier. When the courier said they had at least one soul, Lukas stated that he had to deliver seven souls for seven sins. Lukas could locate the box but he had to find a way around the sisters. He then decided to infect the sisters with sins and proceeded to vanquish the courier.

Lukas faded into the manor whilst the sisters and Leo were upstairs and located the box. When Phoebe came downstairs, he infected her with Lust. When Prue, Piper and Leo followed, he infect them with pride, gluttony and sloth respectively, and disappeared.

The officer which Phoebe fancied got suspended because he and Phoebe were about to have sex in the middle of a crisis. When he became angry, Lukas faded in and infected him with Anger. He ordered the officer to find the location of the pastor infected with Envy and proceeded to send the officer after the Halliwells.

After the officer attacked the manor and hurt Piper and Phoebe, Lukas faded in and grabbed Prue from behind. He took her to his lair and tied her up. He revealed Pride was the deadliest sin because it makes people think they're invincible. He tried to make a deal to locate the pastor and then opened a bottomless pit. Prue pretended to agree to the deal, but then jumped into the pit so Lukas would lose and she would win.

At that moment, Leo orbed in with the sisters and saved Prue by orbing after her. After Piper froze Lukas, Phoebe threw the remaining sins at him. Overwhelmed, Lukas fell into the pit, causing the remaining sins to leave their victims and follow him. Phoebe then threw the empty box into the pit and it closed.